there's no point in looking in blib/lib instead of lib

especially since we're building the module names from the file names

so long as no .pm are generated automatically, this works fine

this is also useful when someone doesn't want to install Dist::Zilla
just to test a patch)
test loading the modules in isolation

the benefit over "use_ok" is that the modules are loaded at compile time
and one at a time, which ensures that their dependencies (at least the
ones needed to load the module) are properley declared (using "use")